change: site name in header

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.23%. Comparing base (fe6c888) to head (5c464f8). Report is 563 commits behind head on main.

Files	Patch %	Lines
src/arpeng/site/settings.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1053 +/- ## ======================================= Coverage 78.23% 78.23% ======================================= Files 151 151 Lines 5394 5394 Branches 865 865 ======================================= Hits 4220 4220 Misses 1043 1043 Partials 131 131 ```

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